package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class DelOperation implements IOperation{
    public void work(BookList bookList) {
        System.out.println("删除图书....");

        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你要删除的书名：");
        String bookName=scanner.nextLine();


        int currentSize= bookList.getUsedSize();//获取当前书架上有几本书
        int pos=-1;
        int i=0;
        for(;i<currentSize;i++) {
            Book book= bookList.getBook(i);
            if(book.getName().equals(bookName)) {
               //找到这本书了，记录下标
                pos=i;
                break;
            }
        }
        if(i>=currentSize) {
            System.out.println("没有你要找的数");
            return;
        }
        //开始删除了
        for(int j=pos;j<currentSize-1;j++) {
            Book book=bookList.getBook(j+1);
            bookList.setBook(j,book);
        }
        //修usedSize
        bookList.setUsedSize(currentSize-1);

        bookList.setBook(currentSize-1,null);
        System.out.println("删除成功！");
    }
}
